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Lenart Zadnik: Hydrodynamics in the effective description of the large-anisotropy Heisenberg model

January 19 @ 2:00 pm - 3:30 pm

The recent decade has witnessed several breakthroughs in the description of relaxation of local observables in quantum many-body systems prepared far from equilibrium. In contrast, the time evolution on time scales that precede relaxation towards the stationary state  has remained much less explored. Strong coupling expansions offer a good starting point for investigation of such problems, since they provide  a natural time scale, on which prerelaxation can occur. I will discuss the microscopic and ballistic-scale mesoscopic dynamics, described by the effective Hamiltonian that arises in the large-coupling limit of the anisotropic Heisenberg spin-1/2 chain. In particular, I will revisit the ballistic scale
hydrodynamics emerging after a sudden junction of two thermal or chemical reservoirs. In its framework, the nonselective emergence of discontinuities  in the profiles of local observables suggests inherent nonballistic behaviour.

* Lenart Zadnik, Universite Paris-Saclay

The seminar will be online via Zoom (ID: 281 621 2459, Password: 667124)



January 19
2:00 pm - 3:30 pm